/*
 * RED5 Open Source Media Server - https://github.com/Red5/
 * 
 * Copyright 2006-2016 by respective authors (see below). All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.red5.codec;

import org.apache.mina.core.buffer.IoBuffer;

/**
 * Red5 audio codec for the PCM uLaw audio format.
 *
 * Stores the decoder configuration
 * 
 * @author Paul Gregoire (mondain@gmail.com)
 */
public class ULAWAudio implements IAudioStreamCodec {

    static final String CODEC_NAME = "PCM uLaw";

    @Override
    public String getName() {
        return CODEC_NAME;
    }

    @Override
    public void reset() {
    }

    @Override
    public boolean canHandleData(IoBuffer data) {
        if (data.limit() == 0) {
            // Empty buffer
            return false;
        }
        byte first = data.get();
        boolean result = (((first & 0xf0) >> 4) == AudioCodec.PCM_MULAW.getId());
        data.rewind();
        return result;
    }

    @Override
    public boolean addData(IoBuffer data) {
        return false;
    }

    @Override
    public IoBuffer getDecoderConfiguration() {
        return null;
    }

}
